Byju's Placement Papers 2025

Overview

This page is a working set of BYJU’S placement papers from 2025: from student reports questions, the 2025 online assessment pattern, and step-by-step solutions. Use it to see what BYJU’S actually asked in the latest cycle, how hard the rounds were, and which themes (DSA, system design, aptitude, or role-specific topics) mattered most. Practice the problems below under timed conditions, then cross-check with the interview and preparation guides if you are targeting an upcoming BYJU’S drive.

BYJU’S Online Assessment 2025 pattern

Section	Questions	Time	Difficulty
Coding Problems	2-3	90 min	Medium-Hard

BYJU’S Placement Papers 2025 - actual questions & solutions

This section contains practice questions styled on BYJU’S placement papers 2025 (recent-cycle pattern), with worked solutions. Use them as timed sectional drills - from student reports drives vary by college and role, so treat this as a high-signal practice bank, not an official paper dump.

Question 1: binary tree level order

Show solution

Problem Statement: Return the level-order traversal of a binary tree.

Example:

Input: [3,9,20,null,null,15,7]
Output: [[3],[9,20],[15,7]]

Solution (Java):

public List<List<Integer>> levelOrder(TreeNode root) {
    List<List<Integer>> res = new ArrayList<>();
    if (root == null) return res;
    Queue<TreeNode> q = new ArrayDeque<>();
    q.add(root);
    while (!q.isEmpty()) {
        int sz = q.size();
        List<Integer> level = new ArrayList<>();
        for (int i = 0; i < sz; i++) {
            TreeNode n = q.poll();
            level.add(n.val);
            if (n.left != null) q.add(n.left);
            if (n.right != null) q.add(n.right);
        }
        res.add(level);
    }
    return res;
}

Time Complexity: O(n)
Space Complexity: O(n)

Question 2: maximum subarray sum

Show solution

Problem Statement: Find the contiguous subarray with the largest sum.

Example:

Input: [-2, 1, -3, 4, -1, 2, 1, -5, 4]
Output: 6  // [4, -1, 2, 1]

Solution (Java):

public int maxSubArray(int[] nums) {
    int best = nums[0], cur = nums[0];
    for (int i = 1; i < nums.length; i++) {
        cur = Math.max(nums[i], cur + nums[i]);
        best = Math.max(best, cur);
    }
    return best;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 3: check palindrome

Show solution

Problem Statement: Return true if the string reads the same forward and backward (ignore case).

Example:

Input: "Level"
Output: true

Solution (Java):

public boolean isPalindrome(String s) {
    s = s.toLowerCase();
    int i = 0, j = s.length() - 1;
    while (i < j) {
        if (s.charAt(i++) != s.charAt(j--)) return false;
    }
    return true;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 4: detect cycle in linked list

Show solution

Problem Statement: Return true if the linked list has a cycle.

Example:

Input: 3→2→0→-4→(back to 2)
Output: true

Solution (Java):

public boolean hasCycle(ListNode head) {
    ListNode slow = head, fast = head;
    while (fast != null && fast.next != null) {
        slow = slow.next;
        fast = fast.next.next;
        if (slow == fast) return true;
    }
    return false;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 5: reverse a string

Show solution

Problem Statement: Given a string, return it reversed.

Example:

Input: "placement"
Output: "tnemecalp"

Solution (Java):

public String reverse(String s) {
    return new StringBuilder(s).reverse().toString();
}

Time Complexity: O(n)
Space Complexity: O(n)

Question 6: two sum

Show solution

Problem Statement: Given an array of integers and a target, return indices of two numbers that add up to target.

Example:

Input: nums = [2, 7, 11, 15], target = 9
Output: [0, 1]

Solution (Java):

public int[] twoSum(int[] nums, int target) {
    Map<Integer, Integer> map = new HashMap<>();
    for (int i = 0; i < nums.length; i++) {
        int need = target - nums[i];
        if (map.containsKey(need)) return new int[]{map.get(need), i};
        map.put(nums[i], i);
    }
    return new int[]{};
}

Time Complexity: O(n)
Space Complexity: O(n)

Question 7: first non-repeating character

Show solution

Problem Statement: Return the first non-repeating character in a string, or ‘_’ if none.

Example:

Input: "swiss"
Output: 'w'

Solution (Java):

public char firstUnique(String s) {
    int[] freq = new int[256];
    for (char c : s.toCharArray()) freq[c]++;
    for (char c : s.toCharArray()) if (freq[c] == 1) return c;
    return '_';
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 8

Q8: Which SQL clause filters grouped rows after GROUP BY?

Solution:

HAVING filters aggregates; WHERE filters rows before grouping.

Answer: HAVING

Question 9

Q9: Worst-case time complexity of quicksort is?

Solution:

Unbalanced partitions (already sorted with bad pivot) → O(n²).

Answer: O(n²)

Question 10

Q10: In OOP, hiding internal details and showing only essential features is called?

Solution:

This is the definition of Encapsulation (often paired with abstraction in interviews).

Answer: Encapsulation

Question 11

Q11: Virtual memory is typically implemented using?

Solution:

OS uses demand paging (and sometimes segmentation) to implement virtual memory.

Answer: Demand paging

Key insights from 2025 BYJU’S Online Assessment

Coding Section is Critical: Must solve 2-3 coding problems correctly to advance
Personalized Learning Focus: Strong emphasis on ed-tech platform design, adaptive learning systems, AI-powered personalization
Time Management: 2-3 problems in 90 minutes requires excellent speed and accuracy
Success Rate: Only 10-15% cleared OA and advanced to interviews
Platform: BYJU’S assessment platform or HackerRank
Focus Areas: Arrays, trees, graphs, dynamic programming, personalized learning systems, AI-powered ed-tech
Enhanced Emphasis: Optimal solutions, AI-powered personalization, and adaptive learning systems

BYJU’S 2025 interview experiences

Based on recent candidate experiences from 2025 BYJU’S interviews:

2025 Interview Process:

Online Assessment (90 minutes): 2-3 coding problems
Technical Phone Screen (45-60 minutes): Coding problems, algorithm discussions, ed-tech concepts, AI/ML
Onsite/Virtual Interviews (4-5 rounds, 45-60 minutes each):

Coding rounds (2-3): Algorithms, data structures, problem-solving
System Design rounds: AI-powered ed-tech platforms, adaptive learning systems, personalized learning paths, content delivery
Behavioral rounds: Problem-solving approach, education passion, impact, AI/ML passion

2025 Interview Trends:

Increased emphasis on AI-powered personalization and adaptive learning systems
More focus on optimal solutions and modern ed-tech technologies
Enhanced behavioral questions about innovation and education passion
Questions about AI/ML applications in ed-tech and personalized learning

Common 2025 Interview Topics:

Coding: Arrays, strings, trees, graphs, dynamic programming, adaptive learning algorithms
System Design: AI-powered ed-tech platforms, adaptive learning systems, personalized learning paths, content delivery
Behavioral: Problem-solving, education passion, teamwork, impact, AI/ML passion
BYJU’S Technologies: Ed-tech platforms, AI-powered features, adaptive learning systems, personalized learning paths

Success Tips:

Strong coding performance is essential - solve problems optimally
Understand ed-tech concepts, AI-powered personalization, and adaptive learning systems
Practice system design for AI-powered ed-tech platforms and adaptive learning systems
Prepare examples demonstrating problem-solving and education passion
Learn BYJU’S products, AI features, and ed-tech technologies
Practice explaining your thought process clearly

For detailed interview experiences from 2025, visit BYJU’S Interview Experience page.

Preparation tips for BYJU’S 2025 pattern

Master Coding Fundamentals: Focus on solving 2-3 coding problems correctly - arrays, trees, graphs, DP
Ed-Tech Expertise: Strong understanding of AI-powered ed-tech systems, adaptive learning systems, personalized learning paths
Practice Previous Year Papers: Solve BYJU’S OA papers from 2020-2025 to understand evolving patterns
Time Management: Practice completing 2-3 coding problems in 90 minutes
LeetCode Practice: Solve 200+ LeetCode problems focusing on arrays, strings, trees, graphs (medium-hard difficulty)
Ed-Tech Focus: Practice problems related to ed-tech systems and adaptive learning
System Design Mastery: Learn AI-powered ed-tech platform design, adaptive learning systems, personalized learning paths
BYJU’S Technologies: Learn ed-tech platforms, AI-powered features, adaptive learning systems, personalized learning paths
Behavioral Preparation: Prepare examples using STAR format - problem-solving, education passion, AI/ML passion
Mock Tests: Take timed practice tests to improve speed and accuracy
AI/ML in Ed-Tech: Understand AI/ML applications in ed-tech and personalized learning

Comments & Suggestions

2024 papers

Coding questions

Interview experience

Preparation guide

BYJU'S hub

Similar companies

Unacademy · Amazon · Flipkart · Google · Microsoft · TCS

Byju's Placement Papers 2025

Overview

BYJU’S Online Assessment 2025 pattern

BYJU’S Placement Papers 2025 - actual questions & solutions

Question 1: binary tree level order

Question 2: maximum subarray sum

Question 3: check palindrome

Question 4: detect cycle in linked list

Question 5: reverse a string

Question 6: two sum

Question 7: first non-repeating character

Question 8

Question 9

Question 10

Question 11

Key insights from 2025 BYJU’S Online Assessment

BYJU’S 2025 interview experiences

Preparation tips for BYJU’S 2025 pattern

Comments & Suggestions

Related resources

Similar companies